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Re: TTML2 wide review comment: styling

From: r12a <ishida@w3.org>
Date: Thu, 5 Oct 2017 10:01:47 +0100
To: David Singer <singer@apple.com>, Glenn Adams <glenn@skynav.com>
Cc: David Ronca <dronca@netflix.com>, Timed Text Working Group <public-tt@w3.org>, Pierre-Anthony Lemieux <pal@sandflow.com>
Message-ID: <496feacb-9e15-9223-7eff-f3d0103efcfa@w3.org>
On 04/10/2017 15:42, David Singer wrote:
>> On Oct 3, 2017, at 22:49 , Glenn Adams <glenn@skynav.com> wrote:
>> Actually, I was responding to David Singer regarding the CSS WG having discussed oblique. While that is true, I don't know whether they have discussed shear.
> Yes, I searched for both words, as the usage sometimes overlaps, though oblique is usually used for a designed oblique face, and shear for a generated one. (However, there is plenty of practice that mixes it up; the original Mac did italic by shearing iirc.)

Here is some relevant text from CSS:

     selects a font that is labeled as an oblique face, or an italic 
face if one is not

If no italic or oblique face is available, oblique faces can be 
synthesized by rendering non-obliqued faces with an artificial obliquing 
operation. The use of these artificially obliqued faces can be disabled 
using the ‘font-synthesis’ property. The details of the obliquing 
operation are not explicitly defined.

Authors should also be aware that synthesized approaches may not be 
suitable for scripts like Cyrillic, where italic forms are very 
different in shape. It is always better to use an actual italic font 
rather than rely on a synthetic version.

Many scripts lack the tradition of mixing a cursive form within text 
rendered with a normal face. Chinese, Japanese and Korean fonts almost 
always lack italic or oblique faces. Fonts that support a mixture of 
scripts will sometimes omit specific scripts such as Arabic from the set 
of glyphs supported in the italic face. User agents should be careful 
about making character map assumptions across faces when implementing 
support for system font fallback.
from https://www.w3.org/TR/css-fonts-3/#oblique

Received on Thursday, 5 October 2017 09:01:58 UTC

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